Security readout for executives and security teams
Plain-English summary
LibRaw contains a critical heap buffer overflow in HuffTable::initval for the listed commits. A maliciously crafted file can trigger memory corruption when processed. Organizations that accept or automatically process untrusted RAW image files should treat this as urgent until vendor or distribution guidance confirms exposure and fixes.
Executive priority
Treat this as a high-priority remediation item for any business process handling external image files. The impact rating is critical, but exploitation evidence is not established in the provided sources.
Technical view
CVE-2026-20911 affects LibRaw commit 0b56545 and commit d20315b. The flaw is a heap-based buffer overflow tied to HuffTable::initval, mapped to CWE-120 and CWE-131. The published CVSS 3.1 score is 9.8 with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where LibRaw is embedded in services, desktop tools, batch pipelines, or upload workflows that parse untrusted image files. The source bundle only names LibRaw commits 0b56545 and d20315b, so downstream package exposure must be verified separately.
Exploitation context
The sources state that a specially crafted malicious file can trigger the overflow. The bundle does not identify active exploitation, and KEV status is false. No exploit maturity or public weaponization evidence is provided here.
Researcher notes
Evidence is strong for vulnerability type, affected commits, trigger class, and CVSS impact. Evidence is incomplete for fixed versions, downstream distribution status, exploit availability, and real-world attacks. Avoid expanding affected products beyond LibRaw without package-specific confirmation.
Mitigation direction
- Check LibRaw and distribution vendor advisories for fixed versions or backports.
- Restrict processing of untrusted RAW image files until exposure is resolved.
- Prioritize updates for internet-facing upload and automated image-ingestion workflows.
- Add temporary isolation around file conversion or metadata extraction services.
- Track Red Hat, Talos, and LibRaw guidance for package-specific remediation.
Validation and detection
- Inventory applications and services that link, bundle, or package LibRaw.
- Compare deployed LibRaw code against commits 0b56545 and d20315b.
- Review SBOMs and vendored dependencies for hidden LibRaw copies.
- Identify workflows that accept attacker-supplied image files.
- Confirm vendor package status before closing remediation tickets.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-131: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20911 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9talosCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H1.65.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-04-07T15:06:26.352Z: Reported to Red Hat.
- 2026-04-07T13:49:31.223Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2026-2330CVE reference, talos
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2330CVE reference, CVE
- https://access.redhat.com/security/cve/CVE-2026-20911CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2455959CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20911.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Incorrect Calculation of Buffer Size
Incorrect Calculation of Buffer Size represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.