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CVE-2026-82398

pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Py-pdf
Products
Pypdf
CVE-2026-119195

pyasn1: Quadratic-time denial of service in constructed string and indefinite-length ANY decoding

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed string and indefinite-length ANY decoding repeatedly concatenates each fragment onto a growing bytes value. Attacker-controlled BER or CER data can use many constructed OCTET STRING or character-string fragments. DER rejects constructed OCTET STRING without a schema, but accepts its definite-length form when asn1Spec selects univ.OctetString; it also accepts constructed character strings such as UTF8String without a schema, even though those encodings are not valid DER. The separate indefinite-length ANY path is reachable in BER and CER when asn1Spec selects univ.Any; DER rejects indefinite lengths. OctetStringPayloadDecoder uses growing header concatenation and AnyPayloadDecoder.indefLenValueDecoder uses growing chunk concatenation, repeatedly copying an increasing prefix and causing quadratic work. A sufficiently fragmented value can occupy decoding workers and cause CPU exhaustion without confidentiality or integrity impact. This issue is fixed in version 0.6.5.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Pyasn1
Products
Pyasn1
CVE-2026-115319

fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents

fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed
Vendors
Junegunn
Products
Fzf
CVE-2026-111758

markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)

markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Markdown-it
Products
Markdown-it
CVE-2026-42499

Quadratic string concatenation in consumePhrase in net/mail

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Net\/mail Go
CVE-2026-71429

stream-json: pick/ignore/filter/replace filters are O(depth²) on nested input — small crafted JSON blocks the event loop for seconds→minutes (DoS)

stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3.5.0, the path filters pick, ignore, filter, and replace in src/core/filters/filter-base.js recompute the full path string from the nesting stack for every checkable token. Because the stack length equals the current nesting depth and a checkable token is emitted at every level, a depth D document costs O(D²) rather than O(D) to process. The issue is triggered by nesting depth rather than byte volume, including the documented pick({filter: 'data'}) traversal-until-match path, so an application that sends untrusted JSON through a string or RegExp filter can block the Node.js event loop and cause denial of service with a small deeply nested document. The streamArray, streamObject, and streamValues streamers are not affected because they use the constant-time asm.depth getter. This issue is fixed in version 3.5.0.

CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed
Vendors
Uhop
Products
Stream-json
CVE-2026-53433

Denial of Service in fzf

fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to inefficient HTTP body processing using repeated string concatenation, resulting in quadratic time complexity (O(n²)). A crafted POST request with many small segments can trigger excessive CPU usage during request handling.This allows a single malicious request to monopolize the single‑threaded HTTP server, blocking all other clients and resulting in denial of service. This issue was fixed in version 0.73.1.

CVSS 4.0 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Fzf Junegunn
Products
Fzf Fzf
CVE-2026-23955

EVerest vulnerable to concatenation of strings literal and integers

EVerest is an EV charging software stack. Prior to version 2025.9.0, in several places, integer values are concatenated to literal strings when throwing errors. This results in pointers arithmetic instead of printing the integer value as expected, like most of interpreted languages. This can be used by malicious operator to read unintended memory regions, including the heap and the stack. Version 2025.9.0 fixes the issue.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Vendors
Everest Linuxfoundation
Products
Everest-core Everest
CVE-2025-61724

Excessive CPU consumption in Reader.ReadResponse in net/textproto

The Reader.ReadResponse function constructs a response string through repeated string concatenation of lines. When the number of lines in a response is large, this can cause excessive CPU consumption.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Golang
Products
Go Net