Low Denial of service exploit reference

CVE-2026-91781 — GNU Binutils ELF Section elf64-x86-64.c elf_x86_64_common_section_index null pointer dereference

A security vulnerability has been detected in GNU Binutils 2.47. Affected is the function elf_x86_64_common_section_index of the file bfd/elf64-x86-64.c of the component ELF Section Handler. The manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed publicly and may be used. Upgrading to version 2.48 is able to address this issue. The identifier of the patch is 7322e9bc30cb282575a701c307851fd3d66fee68. It is suggested to upgrade the affected component.

Published Sep 15, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Gnu

Binutils

CVSS base

3.3

Low · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Gnu Binutils).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Gnu	Binutils	version 2.47	Vulnerable	NIST National Vulnerability Database
Gnu	Binutils	version 2.47	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
4.8	CVSS 4.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
1.9	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
3.3	CVSS 3.1	Low	1.8	1.4	cna@vuldb.com via NIST National Vulnerability Database
3.3	CVSS 3.1	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
3.3	CVSS 3.0	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
1.7	CVSS 2.0	Low	3.1	2.9	cna@vuldb.com via NIST National Vulnerability Database
1.7	CVSS 2.0	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-404 · Improper Resource Shutdown or Release

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Track CPU/memory spikes and availability drops correlated with request patterns.

endpoint telemetry (EDR)resource metrics

Timeline

What happened to this CVE, newest first.

2026
Affected products added · gnu/binutils
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 3.3
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 15, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

sourceware.org/git/gitweb.cgi
Third Party Advisory, broken-link, patch, NIST National Vulnerability Database
vuldb.com/cve/CVE-2026-91781
Third Party Advisory, third-party-advisory, NIST National Vulnerability Database
sourceware.org/bugzilla/show_bug.cgi
Exploit, Third Party Advisory, issue-tracking, NIST National Vulnerability Database
vuldb.com/vuln/404052
Third Party Advisory, vdb-entry, technical-description, NIST National Vulnerability Database
github.com/Ech06/CVE_submit/tree/main/bugzilla/pocs/34449
Third Party Advisory, exploit, NIST National Vulnerability Database
vuldb.com/vuln/404052/cti
Permissions Required, signature, permissions-required, NIST National Vulnerability Database
www.gnu.org/
Product, broken-link, product, NIST National Vulnerability Database
vuldb.com/submit/933336
Third Party Advisory, third-party-advisory, NIST National Vulnerability Database

Elsewhere on this site

Gnu
every CVE for this vendor

Denial of service
same class

CWE-404
other pages naming this weakness

Related CVEs (same products)

Low CVE-2026-91782 GNU Binutils Dynamic Relocation Allocation elfxx-x86.c elf_x86_allocate_dynrelocs null pointer dereference Sep 15, 2026
Low CVE-2026-91780 GNU Binutils elflink.c elf_link_add_object_symbols null pointer dereference Sep 15, 2026
Low CVE-2026-91779 GNU Binutils Eh Frame elf-eh-frame.c _bfd_elf_eh_frame_section_offset null pointer dereference Sep 15, 2026
Medium CVE-2026-90830 GNU Binutils Section Merge merge.c _bfd_write_merged_section null pointer dereference Sep 14, 2026
Medium CVE-2026-90829 GNU Binutils SHT_GROUP Section elf.c bfd_elf_set_group_contents null pointer dereference Sep 14, 2026
Medium CVE-2026-90831 GNU Binutils ELF String Table elf-strtab.c _bfd_elf_strtab_delref memory corruption Sep 14, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-91781 is "GNU Binutils ELF Section elf64-x86-64.c elf_x86_64_common_section_index null pointer dereference", rated Low. It affects Binutils (Gnu); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 3.3 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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