Heap out-of-bounds read in libdwarf debug address table parsing
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · Low
- Fix status
- Deferred Red Hat: fix deferred
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
Summary
libdwarf versions through 2.3.3 are affected. The validation of the .debug_addr unit length in dwarf_debug_addr_table() omits the table starting offset (CWE-125), so a crafted object file with a non-zero offset table makes dwarf_debug_addr_by_index() read past a heap buffer. An attacker who supplies such a file can disclose adjacent heap bytes or crash consumers of the library.
Written with Claude Haiku 5.5 from the sources below · 2026-10-31
Description from the CNA
libdwarf through 2.3.3 contains a heap out-of-bounds read vulnerability in dwarf_debug_addr_table() that omits the table starting offset when validating .debug_addr unit length. Attackers can supply a crafted object file with a non-zero offset table, causing dwarf_debug_addr_by_index() to read past the heap buffer, disclosing adjacent heap bytes or crashing consumers.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for libdwarf. Red Hat rates the flaw Moderate and lists Red Hat Enterprise Linux 7 and Red Hat Enterprise Linux 8 as affected, with the plan given as none available. The sources give no mitigation.
Written with Claude Haiku 5.5 from the sources below · 2026-10-31
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-26 Threatist record created from CVE-2026-116732
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-27 CVSS score added · Red Hat
- 2026-10-27 Alias added: GHSA-8mx3-4rwx-rhjv
- 2026-10-31 CISA SSVC decision points changed
References
Sources
- CVE-2026-116732 · CVE Program
- CVE-2026-116732 · NVD
- FIRST EPSS
- GHSA-8mx3-4rwx-rhjv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-116732 · Red Hat security data · CC BY 4.0
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