HighCVE-2026-81934

    Redis TLS pending-data list use-after-free (CVE-2026-81934)

    Published Last modified Sources: Debian, Debian LTS, Ubuntu, BSI, SUSE, CVE.org

    What is affected, what to do

    Redis contains a use-after-free vulnerability in the 'tlsProcessPendingData()' function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server.

    An exploit is publicly available. Update Redis to version 8.8.2, Redis to version 8.2.9, Redis to version 8.4.6.

    Affected
    • Redis lt *..8.8.2
    • Redis lt *..8.2.9
    • Redis lt *..8.4.6
    • Redis lt *..8.6.6
    • Redis lt *..8.10.1
    • Redis lt *..7.4.11
    • Redis lt *..6.2.24
    • Redis lt *..7.2.16
    • Redis Software (Enterprise) lt *..8.2.0-46
    • Redis Software (Enterprise) lt *..8.0.20-96
    • Redis Software (Enterprise) lt *..7.22.2-179
    • Redis Software (Enterprise) lt *..7.8.6-303
    Fixed in
    • Redis 8.8.2
    • Redis 8.2.9
    • Redis 8.4.6
    • Redis 8.6.6
    • Redis 8.10.1
    • Redis 7.4.11
    • Redis 6.2.24
    • Redis 7.2.16
    • Redis Software (Enterprise) 8.2.0-46
    • Redis Software (Enterprise) 8.0.20-96
    • Redis Software (Enterprise) 7.22.2-179
    • Redis Software (Enterprise) 7.8.6-303

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v4

    7.1

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Debian, Debian LTS, Ubuntu, BSI, SUSE, CVE.org

    0.5 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 41.4

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    75.51 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    PoC (publicly reported)
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.1
    CVSS v4

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.5 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    41.4
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: proof of concept · not automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 28 August 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-416

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    Redis contains a use-after-free vulnerability in the 'tlsProcessPendingData()' function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server.

    Source: Debian Security Advisories, Debian LTS Advisories, Ubuntu Security Notices, BSI WID Portal, BSI CSAF, suse_csaf, cvelistv5, NVD (NIST)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    RedisRedis
    • < 8.4.6
    • < 6.2.24
    • < 8.6.6
    • < 7.2.16
    • < 7.4.11
    • < 8.2.9
    • < 8.8.2
    • < 8.10.1
    • 8.4.6
    • 6.2.24
    • 8.6.6
    • 7.2.16
    • 7.4.11
    • 8.2.9
    • 8.8.2
    • 8.10.1
    RedisRedis Software (Enterprise)
    • < 8.2.0-46
    • < 7.8.6-303
    • < 8.0.20-96
    • < 7.22.2-179
    • 8.2.0-46
    • 7.8.6-303
    • 8.0.20-96
    • 7.22.2-179
    Open SourceRedis
    • < 8.10.1
    • < 8.8.2
    • < 8.2.9
    • < 8.6.6
    • < 8.4.6
    • 8.10.1
    • 8.8.2
    • 8.2.9
    • 8.6.6
    • 8.4.6

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianredisbookworm
    Linuxdebianredistrixie
    Linuxubunturedisjammy
    Linuxubunturedisnoble
    Linuxubunturedisresolute

    Weakness classes (CWE)

    • CWE-416Use After Free

      Variant

      The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

      Entry at MITRE CWE-416

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    Reference tagged as exploitgithub.com (opens in a new tab)PoC (publicly reported)reported, not verified—

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modified9119a7d8…

      CVSS V4.0: AV:A/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

      CVSS V4.0: before AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N, after —

      CVSS V3.1: AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

      CVSS V3.1: before AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, after —

      Description added or changed

      Show 23 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionchanged
      Redis contains a use-after-free vulnerability in the 'tlsProcessPendingData()' function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server. Fixed in Redis 8.2.9, 8.4.6, 8.6.6, 8.8.2, and 8.10.1.
      Redis contains a use-after-free vulnerability in the 'tlsProcessPendingData()' function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server.
      CVSSadded
      —
      AV:A/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
      CVSSremoved
      AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
      —
      CVSSadded
      —
      AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
      CVSSremoved
      AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
      —
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/81xxx/CVE-2026-81934.json">CVE-2026-81934</a>
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/6.2.24
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/7.2.16
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/7.4.11
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/8.10.1
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/8.2.9
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/8.4.6
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/8.6.6
      Referenceadded
      —
      https://github.com/redis/redis/releases/tag/8.8.2
      Referenceadded
      —
      https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-239-01.json
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/6.2/00-RELEASENOTES
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/7.2/00-RELEASENOTES
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/7.4/00-RELEASENOTES
      Referenceadded
      —
      https://redis.io/docs/latest/operate/rs/release-notes/rs-7-22-releases/rs-7-22-2-179/
      Referenceadded
      —
      https://redis.io/docs/latest/operate/rs/release-notes/rs-7-8-releases/rs-7-8-6-303/
      Referenceadded
      —
      https://redis.io/docs/latest/operate/rs/release-notes/rs-8-0-releases/rs-8-0-20-96/
      Referenceadded
      —
      https://redis.io/docs/latest/operate/rs/release-notes/rs-8-2-releases/rs-8-2-0-46/
      Referenceadded
      —
      https://www.cve.org/CVERecord?id=CVE-2026-81934

      Source identifier: 9119a7d8-5eab-497f-8521-727c672e3725

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: proof of concept, automatable: no

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-81934","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-28T15:13:56.058373Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    3. Received9119a7d8…

      CVSS V4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

      CISA assessment (SSVC): exploitation: proof of concept, automatable: no

      Weakness type: CWE-416

      Description added or changed

      Show 13 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      Redis contains a use-after-free vulnerability in the 'tlsProcessPendingData()' function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server. Fixed in Redis 8.2.9, 8.4.6, 8.6.6, 8.8.2, and 8.10.1.
      CVSSadded
      —
      AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
      Weakness type (CWE)added
      —
      CWE-416
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/81xxx/CVE-2026-81934.json">CVE-2026-81934</a>
      Referenceadded
      —
      https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834
      Referenceadded
      —
      https://github.com/v12-security/pocs/tree/main/redis/server_ssl
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/8.10/00-RELEASENOTES
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/8.2/00-RELEASENOTES
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/8.4/00-RELEASENOTES
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/8.6/00-RELEASENOTES
      Referenceadded
      —
      https://raw.githubusercontent.com/redis/redis/8.8/00-RELEASENOTES
      SSVC assessmentadded
      —
      {"id":"CVE-2026-81934","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-27T19:12:51.964039Z"}

      Source identifier: 9119a7d8-5eab-497f-8521-727c672e3725

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