CVE-2026-86145: Out-of-bounds write allows arbitrary code execution via crafted regular expressions
CVE-2026-86145 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- Critical
- CVSS base score
- 8.2 (Red Hat)
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L(Red Hat)
- Weakness
- CWE-787
- Fixed releases
- Red Hat: pcre2-0:10.44-1.5.el10_2, pcre2-0:10.32-4.el8_10, pcre2-0:10.40-7.el9_8, pcre2-0:10.40-2.el9_2.1, pcre2-0:10.40-5.el9_4.1, pcre2-0:10.40-6.el9_6.1 and 14 more in the advisory
- Listed by VulniPulse
- Record changed
Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-86145; each belongs to its advisory, not to every product listed. How records are collected and checked.
How do I fix CVE-2026-86145?
Upgrade to a fixed release named by the vendor:
- Red Hat: pcre2-0:10.44-1.5.el10_2, pcre2-0:10.32-4.el8_10, pcre2-0:10.40-7.el9_8, pcre2-0:10.40-2.el9_2.1, pcre2-0:10.40-5.el9_4.1, pcre2-0:10.40-6.el9_6.1
- To mitigate this Improper Protection of Alternate Path vulnerability, ensure that secondary execution branches—such as the reuse of cached memory workspaces—enforce the exact same size and boundary checks as the primary memory allocation paths. Limit exposure by preventing untrusted user input from directly controlling PCRE2 regular expressions, and strictly avoid utilizing recursive matching patterns when operating under a low heap limit. Apply a defense-in-depth strategy by validating all inputs comprehensively. (Red Hat)
Vendor advisories for CVE-2026-86145
Red Hat
1 advisory- Advisory severityHigh8.2
High [CVE-2026-86145] Out-of-bounds write allows arbitrary code execution via crafted regular expressions
CVE-2026-86145Source published Source updated
PCRE2 before 10.48 allows a pcre2_dfa_match out-of-bounds write because reuse of a cached workspace block, in a recursive DFA matching workspace, lacks a size check (even though a newly allocated block, for the same purpose, does have a size check). This outcome requires an attacker-controlled regular expression, or a recursive pattern in conjunction with a small heap limit (this can be set through the API). A flaw was found in PCRE2. An out-of-bounds write vulnerability exists in the `pcre2_dfa_match` function due to improper size checking when reusing cached workspace blocks. This could lead to data corruption or potentially arbitrary code execution, compromising the integrity and availability of the system. Important: An out-of-bounds write vulnerability in the PCRE2 library…
- Affected products in this advisory
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
8 more entries in the full advisory.
- Source-reported affected versions
- < 10.48
- Source-reported fixed versions
- pcre2-0:10.44-1.5.el10_2
- pcre2-0:10.32-4.el8_10
- pcre2-0:10.40-7.el9_8
- pcre2-0:10.40-2.el9_2.1
16 more entries in the full advisory.
- Mitigation guidance
- To mitigate this Improper Protection of Alternate Path vulnerability, ensure that secondary execution branches—such as the reuse of cached memory workspaces—enforce the exact same size and boundary checks as the primary memory allocation paths. Limit exposure by preventing untrusted user input from directly controlling PCRE2 regular expressions, and strictly avoid utilizing recursive matching patterns when operating under a low heap limit. Apply a defense-in-depth strategy by validating all inputs comprehensively.
Veeam
1 advisory- Advisory severityCritical
Critical [CVE-2020-14040 +110] List of Security Fixes and Improvements in Veeam Kasten for Kubernetes
KB4825Source published
This bulletin covers 111 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
List of Security Fixes and Improvements in Veeam Kasten for Kubernetes KB ID: 4825 Product: Kasten K10 by Veeam | 3 | 5 | 5.5 | 6 | 6.5 Published: 2026-03-02 Last Modified: Purpose This article aims to provide our customers' security and compliance teams with detailed information on security improvements. - Veeam Kasten for Kubernetes — Release Notes - Also resolves 13 Medium and 7 Low severity CVEs in the same and other packages. - Upgraded the frontend's bundled JavaScript dependencies to resolve GHSA-g2v6-rqmx-r4w6 in @vue/server-renderer (High). - Upgraded to latest UBI base image to resolve multiple CVEs in base OS packages. - Updated the Go runtime to resolve additional upstream Go CVEs. - Updated the bundled Prometheus Helm chart to resolve security issues. - Upgraded the…
- Related products — impact not confirmed
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- 8.5.10
- 8.5.5
- 1.26.1
- 8.5.3
20 more entries in the full advisory.
- Mitigation guidance
- List of Security Fixes and Improvements in Veeam Kasten for Kubernetes KB ID: 4825 Product: Veeam Kasten for Kubernetes | 7 | 7.5 | 8 | 8.5 | 9 Kasten K10 by Veeam | 3 | 5 | 5.5 | 6 | 6.5 Published: 2026-03-02 Last Modified: 2026-11-05 Purpose This article describes all security-related fixes and improvements introduced in each release or update of Veeam Kasten for Kubernetes.
- It is recommended to upgrade Veeam Kasten and to refresh the token by manually logging out.
- Mitigation: Configure a bucket-level Default Object Lock retention so the object store stamps new objects at write time, or upgrade to Kasten 8.5.10.
- Veeam Kasten for Kubernetes 8.5.5 Upgrade to Go 1.26.1 to address CVE-2026-25679 and CVE-2026-27142 Updated the UBI base image to address CVE-2026-4111 Veeam Kasten for Kubernetes 8.5.3 Upgrade to Go 1.25.7 to address CVE-2025-61732.
4 more entries in the full advisory.
- Workarounds
- Veeam Kasten for Kubernetes 8.0.14 Improved logging security for specific block mode datamover upload Pod invocations.
References
More Red Hat advisories
CVE-2026-34486Apr 9, 2026Missing Encryption of Sensitive Data due to EncryptInterceptor bypassCVE-2026-111497Oct 22, 2026Out-of-Bounds Write in Google Brotli DecoderCVE-2026-46300May 13, 2026"Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRMCVE-2026-31431Apr 22, 2026algif_aead - Revert to operating out-of-placeCVE-2026-109619Oct 21, 2026fatal error handling retains stale request state leading to use-after-freeCVE-2026-109618Oct 21, 2026OOM bailout during request parsing leads to memory corruption and RCE
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