asteval is a Python expression evaluator designed for restricted execution. Prior to 1.0.9, in asteval/astutils.py, the default Interpreter with numpy enabled exposes a ctypes type and permits from_address memory access. safe_getattr blocks the ctypes module but not reachable ctypes type objects, while attribute assignments use unfiltered setattr instead of safe_setattr. An attacker-controlled expression can derive an address with id, read memory through from_address, and write through an attribute assignment. The expression can read or corrupt arbitrary process memory, escape the intended sandbox, execute code, disclose secrets, or crash the host process. This issue is fixed in version 1.0.9.
CVE-2026-102734
MEDIUMPre-NVD 5.55.5
EchelonGraph scoreMEDIUM confidence
“—” beside the score: it is equal to the CVSS score beside it.
This medium-severity CVE scores 5.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (2nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Also known asEUVD-2026-98813 (ENISA EUVD)Source: ENISA EUVD
5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 5.5
- EG Score
- 5.5MEDIUMmedium confidence
- EG Risk
- 25EG Risk 25/100
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.Exploitation0.1% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (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
- 0.1%
- EPSS %ILE
- 2nd
- 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.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.1% within 30 daysSource: FIRST EPSS. 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 every mission impact level.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, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (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.
The score's inputs: 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 13, 2026
Last Modified
October 16, 2026
Advisory Details (4)
Auto-updated Oct 13, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
GitHub release Patch Available
1.0.9
Patch available: lmfit/asteval 1.0.9
https://github.com/lmfit/asteval/releases/tag/1.0.9GitHub commit Patch Available
commit a3e56e7f8ed5 (lmfit/asteval)
Patch available: lmfit/asteval 1.0.9 (contains commit a3e56e7f8ed5)
https://github.com/lmfit/asteval/commit/a3e56e7f8ed567a4817684d94213b290359077b4GitHub pull request Patch Available
Fix exiting exceptions
Patch available: lmfit/asteval 1.0.9 (PR #153 merged 2026-06-11)
https://github.com/lmfit/asteval/pull/153GitHub advisoryMentions a patch (unverified)🟡 PoC Available
Sandbox escape: arbitrary native memory read/write via numpy ctypes in default asteval Interpreter · Advisory · lmfit/asteval · GitHub
https://github.com/lmfit/asteval/security/advisories/GHSA-9w56-46f6-3qhxAffected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| asteval | 0.9 ... 1.0.8 (43 versions) |
| — |
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 26× 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.
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-28 02:25 UTCOSV refresh
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-25 14:56 UTCEG score recompute
- 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-18 05:10 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-16 20:12 UTCEG score recompute
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
- 2026-10-13 21:46 UTCEG score recompute
- 2026-10-13 21:02 UTCEG score recompute
- 2026-10-13 16:30 UTCEG score recompute
- 2026-10-13 15:40 UTCEG score recomputeFirst assessed: 5.5 MEDIUM
Show 1 moreShow fewer
- 2026-10-13 15:39 UTCMITRE cvelistV5first tracked
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Frequently asked(5)
What is CVE-2026-102734?
CVE-2026-102734 is a medium-severity vulnerability; its CVE record was published on October 13, 2026. asteval is a Python expression evaluator designed for restricted execution. Prior to 1.0.9, in asteval/astutils.py, the default Interpreter with numpy enabled exposes a ctypes type and permits from_address memory access. safe_getattr blocks the ctypes module but not reachable ctypes type objects,…
When was the CVE record for CVE-2026-102734 published?
The CVE record for CVE-2026-102734 was published on October 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 16, 2026; the record at its source may have been updated since.
Is CVE-2026-102734 actively exploited?
CVE-2026-102734 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102734?
CVE-2026-102734 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-2026-102734?
A fix for CVE-2026-102734 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-102734
Is Your Infrastructure Affected by CVE-2026-102734?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.