ELFIO through 3.12 contains a NULL pointer dereference vulnerability in relocation_section_accessor get_entry() that allows attackers to crash applications via an unvalidated sh_link index. Attackers can supply a crafted ELF file whose SHT_REL or SHT_RELA section has a dangling sh_link, causing find_hash_section() to dereference null and deny service.
CVE-2026-110659
MEDIUMPre-NVD 5.55.5Trending — 4 sources updated this weekElevatedEG-KEV Tier 3: ElevatedEG-KEV is EchelonGraph's own tiering of exploitation signals from CISA KEV, CISA's SSVC data (Vulnrichment), ransomware data, public exploit-code references and EPSS.Tier 3 is not evidence of exploitation. It means public exploit code is referenced, or CISA's SSVC data says "public PoC", or EPSS ranks the CVE in the top 5%.Signals for this CVE: CISA's SSVC exploitation value: public PoC.EchelonGraph confidence 38%: a heuristic from the tier and the number of signals, not a measured probability.
EchelonGraph scoreHIGH confidence
“—” beside the score: it is equal to the CVSS score beside it.
Score 5.5 from GitHub Security Advisory published 2026-10-14. A secondary CVSS source baseline 5.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
5.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: No code on recordExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 5.5
- EG Score
- 5.5MEDIUMhigh confidence
- EG Risk
- 41EG Risk 41/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity55% × 45%Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.2%
- EPSS %ILE
- 6th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
October 14, 2026
Last Modified
October 20, 2026
Advisory Details (4)
Auto-updated Oct 14, 2026🔬 Proof of concept available. Patch available.
Web page
ELFIO through 3.12 NULL Pointer Dereference via relocation_section_accessor get_entry | Advisories | VulnCheck
https://www.vulncheck.com/advisories/elfio-through-3.12-null-pointer-dereference-via-relocation-section-accessor-get-entryWeb page
GitHub - serge1/ELFIO: ELFIO and ARIO are robust, header-only C++ libraries designed to make binary file and archive manipulation effortless, efficient, and portable. Whether you are building compilers, linkers, binary analysis tools, or custom build systems, these libraries provide the foundation you need for working with ELF files and UNIX archives. · GitHub
https://github.com/serge1/ELFIOWeb page
ELFIO/elfio/elfio_relocation.hpp at 8ae6cec5d60495822ecd57d736f66149da9b1830 · serge1/ELFIO · GitHub
https://github.com/serge1/ELFIO/blob/8ae6cec5d60495822ecd57d736f66149da9b1830/elfio/elfio_relocation.hpp#L142Web page🟡 PoC Available
CVE-2026-110659: ELFIO: NULL pointer dereference in the relocation accessor when a relocation section has a dangling sh_link - HackMD
https://hackmd.io/@haind-pwn/elfio-relocation-get-entry-null-derefVendor Advisories for CVE-2026-110659(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 16× in last 7d / 19× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-20 02:26 UTCEG score recompute
- 2026-10-20 02:26 UTCVendor advisory
- 2026-10-20 02:26 UTCGHSA enrichmentGHSA-78jh-26cf-3958 · GitHub CVSS 5.5
- 2026-10-20 01:34 UTCEG score recompute
- 2026-10-20 01:34 UTCVendor advisory
- 2026-10-20 01:33 UTCGHSA enrichmentGHSA-78jh-26cf-3958 · GitHub CVSS 5.5
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-18 05:06 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-16 19:45 UTCEG score recompute
- 2026-10-16 19:44 UTCGHSA enrichmentGHSA-78jh-26cf-3958 · GitHub CVSS 5.5
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-10-14 17:49 UTCEG score recompute
- 2026-10-14 15:26 UTCEG score recomputeFirst assessed: 5.5 MEDIUM
- 2026-10-14 15:24 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-110659?
CVE-2026-110659 is a medium-severity vulnerability; its CVE record was published on October 14, 2026. ELFIO through 3.12 contains a NULL pointer dereference vulnerability in relocationsectionaccessor getentry() that allows attackers to crash applications via an unvalidated shlink index. Attackers can supply a crafted ELF file whose SHTREL or SHTRELA section has a dangling shlink, causing…
When was CVE-2026-110659 made public?
CVE-2026-110659 was made public on October 14, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on October 14, 2026. EchelonGraph's copy of the record carries a last-modified date of October 20, 2026; the record at its source may have been updated since.
Is CVE-2026-110659 actively exploited?
CVE-2026-110659 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-110659?
CVE-2026-110659 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-110659?
A fix for CVE-2026-110659 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-110659 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-110659
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